CN206035425U - Release device - Google Patents

Abstract

The utility model discloses a hands-free device, which comprises a hands-free upper body and a hands-free lower body. Thread connection, the lower end of the lower body is connected to the downhole pipe string, the upper end of the lower body is provided with a guide sleeve, the inner diameter of the guide sleeve is larger than the outer diameter of the upper body, the guide sleeve and the upper body An annular gap is formed between them. The utility model not only ensures the release function of the release device, but also ensures that the oil injected into the oil pipe and the oil in the annular passage between the oil pipe and the casing pass through the release device and collect in the oil pipe through the guide sleeve at the same time. In order to increase the injection pressure and displacement at the downhole pipe string at the lower end of the drop-off device.

Description

a hands-off device

technical field

The utility model relates to the field of underground operations, in particular to a hands-off device.

Background technique

The traditional hands-off device is a commonly used tool for downhole operations in oil and gas wells, and it is used as a hands-off function for tools such as packers in downhole operations.

In low-permeability and tight gas reservoirs, the single release function of the traditional drop-off device cannot meet the requirements of increasing injection pressure and increasing displacement in the downhole tubing, and cannot realize the drop-off device to reach the target formation.

Contents of the invention

The purpose of this utility model is: aiming at the above-mentioned deficiencies in the prior art, provide a kind of hands-free device which not only has the function of letting go, but also has the function of increasing the pressure and displacement of the oil pipe. It not only ensures the release function of the release device, but also ensures that the oil injected into the oil pipe and the oil in the annular passage between the oil pipe and the casing pass through the release device and collect in the oil pipe through the guide sleeve at the same time, so as to Increase the injection pressure and displacement at the downhole pipe string at the lower end of the hands-off device.

The technical scheme adopted in the utility model is, a device for throwing hands, including an upper body and a lower body, the upper end of the upper body is connected to the oil pipe through a coupling, and the lower end of the upper body is connected to the lower body of the hands. The upper end of the lower body of the hand is threaded, the lower end of the lower body of the hand is connected to the downhole pipe string, the upper end of the lower body of the hand is provided with a guide sleeve, the inner diameter of the guide sleeve is larger than the outer diameter of the upper body of the hand, and the guide An annular space is formed between the sleeve and the upper body of the throwing hand.

The inner wall of the upper end of the guide sleeve is a trumpet-shaped conical surface with a taper of 10°-30°.

Further, the outer wall of the lower end of the guide sleeve is a tapered surface structure, and its taper is 5°-15°.

A sealing structure is provided on the inner surface of the upper end of the lower body.

Further, the inner surface of the upper end of the lower body for throwing hands is provided with a limiting boss for restricting the lower end of the upper body for throwing hands.

Furthermore, the limiting boss is a spline structure.

The beneficial effects of the utility model are:

1. The utility model not only ensures the release function of the release device, but also ensures that the oil injected into the oil pipe and the oil in the annular passage between the oil pipe and the casing pass through the release device and collect in the oil pipe through the guide sleeve at the same time In order to increase the injection pressure and displacement at the downhole string at the lower end of the drop-off device.

2. Simple structure and low manufacturing cost.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is a structural representation of the utility model.

Fig. 2 is a schematic structural view of the upper body of the utility model.

Fig. 3 is a schematic structural view of the lower body of the utility model.

Fig. 4 is a sectional view of A-A of Fig. 3 .

FIG. 5 is an enlarged view of B in FIG. 3 .

Meanings of the codes in the picture: 1—upper body; 101—coupling; 102—external thread on upper body; 2—lower body; 201—internal thread on lower body; 202—external thread on lower body; 203—thread on lower body; 3 —Guide sleeve; 4—Limiting boss; 5—Sealing structure; 501—Sealing ring; 502—Sealing groove.

detailed description

Referring to Fig. 1, Fig. 2, shown in Fig. 3: the utility model is a kind of device for throwing away hands, comprises the upper body 1 of throwing hands and the lower body 2 of throwing hands. The structure is simple and the cost is low.

The upper end of the above upper body 1 is connected to the oil pipe through a coupling 101, and the lower end of the upper body 1 is threadedly connected with the upper end of the lower body 2, that is, the upper internal thread 201 of the upper body of the lower body 2 is connected to the upper body of the upper body. 1 is connected to the upper external thread 102; the lower end of the lower joint where the lower body 2 is located is connected to the downhole pipe string, that is, the lower body thread 203 of the lower body 2 is connected to the downhole pipe string (the downhole pipe string is connected to the lower end of the lower body device) packer or other) top threaded connection.

The upper end of the lower body 2 is provided with a guide sleeve 3 (that is, the outer thread 202 on the lower body of the lower body 2 is threadedly connected with the inner thread at the lower end of the guide sleeve 3), and the inner diameter of the guide sleeve 3 is larger than that of the upper body 1. outer diameter, and an annular gap is formed between the guide sleeve 3 and the upper body 1. Wherein, the inner wall of the upper end of the aforementioned guide sleeve 3 is a trumpet-shaped conical surface with a taper of 10°-30°. The outer wall of the lower end of the aforementioned guide sleeve 3 is a tapered structure with a taper of 5°-15°.

In addition, the screwing direction of the joint between the lower body 2 and the guide sleeve 3 is opposite to the screwing direction of the lower end of the upper body 1 and the upper end of the lower body 2 . To ensure the separation of the hands upper body 1 and the lower body 2; see Fig. 4: the inner surface of the upper part of the lower body 2 is provided with a limiting boss 4 that resists and limits the upper body 1 lower end. The position-limiting boss 4 of the present utility model is a spline structure; referring to Fig. 5 , a sealing structure 5 is arranged on the inner surface of the upper end of the lower body 2, and the sealing structure 5 is mainly composed of a sealing ring 501 and a sealing groove 502. A seal groove 502 is arranged on the inner surface of the lower body 2, and a seal ring 501 is arranged on the seal groove 502 (the seal ring 501 used in the utility model is an "O" seal ring), so as to ensure that the entire oil pipe is in a sealed state.

Working process: Before downhole operation, connect the drop-off device to the tubing in the wellbore, and inject oil into the tubing channel and the annular channel between the tubing and the casing at the same time. In the downhole operation, after the plugging device such as the packer at the lower end of the drop-off device seals the annular passage between the tubing and the casing, the oil in the tubing is injected into the plug-off device such as the drop-off device and the packer through the tubing. The upper end of the plugging device, the oil pipe at the upper end of the locking device rotates to the left to drive the threaded connection section of the upper body 1 and the lower body 2 to separate, and after the threaded connection between the lower body 2 and the upper body 1 is disconnected , because the inner wall of the upper end of the guide sleeve 3 is a trumpet-shaped conical surface and the lower end of the guide sleeve 3 is designed, the oil injected into the annular passage between the oil pipe and the casing flows into the inside of the guide sleeve 3 and then flows into the oil The outer surface of the guide sleeve 3 on the lower body 2 of the hydraulic pressure fits closely with the inner surface of the casing, and the annular passage between the oil pipe and the casing below the guide sleeve 3 is blocked, and the oil pipe and casing above the guide sleeve 3 The oil in the annular channel part flows into the inside of the guide sleeve 3, and the inner surface of the upper end of the guide sleeve 3 is injected into the oil pipe into the guide sleeve 3 with a flared flare (designed as a flared flare to increase the injection volume). Part of the oil is collected together and injected into the lower body 2 of the throwing device, and is pressed into the wellbore at the lower end of the plugging device through the oil pipe, so that the pressure and displacement of the oil injected into the lower oil pipe and the wellbore are increased. It not only ensures the release function of the release device, but also ensures that the oil injected into the oil pipe and the oil in the annular passage between the oil pipe and the casing pass through the release device and collect in the oil pipe through the guide sleeve 3 at the same time, so that The injection pressure and displacement at the downhole string at the lower end of the drop-off device increase.

The above specific technical solutions are only used to illustrate the utility model, not to limit it. Although the utility model has been described in detail with reference to the above-mentioned specific technical solutions, those skilled in the art should understand that: it can still modify the above-mentioned specific technical solutions, or perform equivalent replacements to some of the technical features; and these modifications or replacements , does not make the essence of the corresponding technical solution deviate from the spirit and scope of the present utility model.

Claims (6)

1. a kind of releasing device, including upper body and the lower body of giving up of giving up, the upper end of the upper body of giving up is oily by box cupling connection Pipe, the bottom of the upper body of giving up are threadedly coupled with the upper end of lower body of giving up, the bottom connection down-hole of the lower body of giving up Pipe string, it is characterised in that：The upper end of the lower body of giving up is provided with fairlead, and the internal diameter of the fairlead is outer more than upper body of giving up Footpath, the fairlead and giving up annular clearance of formed between upper body.

2. releasing device according to claim 1, it is characterised in that：The upper end inwall of the fairlead is in horn-like cone Face, its taper are 10 °～30 °.

3. releasing device according to claim 1 or claim 2, it is characterised in that：The bottom outer wall of the fairlead is tied for the conical surface Structure, its taper are 5 °～15 °.

4. releasing device according to claim 1, it is characterised in that：The upper end inner surface of the lower body of giving up is provided with close Seal structure.

5. the releasing device according to claim 1 or 4, it is characterised in that：Set on the upper end inner surface of the lower body of giving up It is equipped with the positive stop lug boss for limiting upper body bottom of giving up.

6. releasing device according to claim 5, it is characterised in that：The positive stop lug boss is spline structure.